I built new PC for the NVIDIA GEFORCE RTX 3090 GPU card. I decided for Fractal Meshify C Tempered Glass case, MPG B550 GAMING CARBON WIFI motherboard and AMD RYZEN 5 3600X processor with 6 cores and 12 threads. I wanted more cores & threads for CPU, but as majority of computations will be running now on GPU anyway, this will do for now. Connecting all the pieces and plugging it in the case was super simple. All cables nicely marked and figuring out where to plug what was not that hard (checkout youtube videos if you have troubles figuring something out). Newegg delivered in several packages, which were tracked by UPS.
And running DeeperThought worked great after installing CUDA with command line. Just type nvcc in terminal and installation command appears. Temperature and wattage went up immediately once computations started. Card is super quiet though (you can hear it, but it's definitely not loud).